Cognomen Rittidej (Rittidej 
) , all over the world, is a very rare last name. The last name Rittidej is characteristic of Thailand, where it is a rare surname, and the United States, where it is an extremely rare surname. Much less frequently, Rittidej is the forename as well as the last name.
Supoj, Itthiphan, Virongrong, Nitchakran, Natthanit, Thanyalak, Pirunthip, Suwattana, Teerasuk, Jakkrit, Peanutt, Korawee, Auratai, Vichet, Narong, Pubhet, Ukrit, Arisa, Nitchakarn, and Anchuleekorn